*{
    margin: 0;
    padding: 0;
    list-style: none;
}


h3{
    height: 40px;
    line-height: 40px;
    text-align: center;
}

.nav{
    width: 95%;
    height: 40px;
    line-height: 40px;
    padding: 5px;
    margin: 10px auto;
    border: 1px solid #ccc;
}

.nav a{
    text-decoration: none;
    color: #000;
    font-size: 14px;
}

.nav a:first-child{
    font-weight: 600;
}

.catalog{
    width: 95%;
    border: 1px solid #ccc;
    margin: 10px auto;
    padding: 5px;
}

.catalog div{
    font-weight: 600;
}

.catalog ul{
    margin-left: 50px;
}

.catalog ul li{
    height: 30px;
    line-height: 30px;
}

.catalog ul li a{
    color: #000;
}

